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Synthesis, characterization and nitrite ion sensing performance of reclaimable composite samples through a core-shell
Xiao Cui1, Zhao Yuqing2, Jiantao Cui1
1Software Engineering College, Zhengzhou University of Light Industry, Zhengzhou 450001, PR China.
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|October 28, 2017
Summary
Researchers developed a reusable optical sensor for nitrite ions using magnetic nanoparticles and rhodamine probes. This platform offers a sensitive and recyclable method for detecting nitrite ions with a low detection limit.
Area of Science:
- Materials Science
- Analytical Chemistry
- Nanotechnology
Background:
- Nitrite ion detection is crucial in environmental and biological monitoring.
- Development of efficient and recyclable sensing platforms remains a challenge.
- Optical sensing offers high sensitivity and selectivity for ion detection.
Purpose of the Study:
- To develop a novel, recyclable optical sensing platform for nitrite ion detection.
- To utilize superamagnetic nanoparticles and rhodamine derivatives for enhanced sensing capabilities.
- To investigate the sensing mechanism and performance of the developed platform.
Main Methods:
- Fabrication of a core-shell structure using superamagnetic nanoparticles (core) and MCM-41 silica (shell).
- Immobilization of rhodamine derivatives as fluorescent probes within the silica shell.
- Characterization using electron microscopy, porous structure analysis, magnetic response, IR spectra, and thermal stability analysis.
- Evaluation of nitrite ion sensing performance, including mechanism study and limit of detection determination.
- Assessment of the platform's recyclability using sulphamic acid.
Main Results:
- The core-shell nanostructure was successfully synthesized and characterized.
- The sensing platform exhibited an 'emission turn-off' effect upon interaction with nitrite ions.
- A static sensing mechanism was proposed, consistent with the Demas quenching equation.
- A low limit of detection (LOD) of 0.4 μM for nitrite ions was achieved.
- The platform demonstrated excellent recyclability, being effectively recovered and reused after quenching.
Conclusions:
- The developed superamagnetic core-shell nanostructure serves as an effective and recyclable optical sensor for nitrite ions.
- The combination of superamagnetic nanoparticles and rhodamine probes provides a sensitive and robust sensing platform.
- The proposed sensing mechanism and demonstrated recyclability highlight the potential of this platform for practical applications in nitrite ion monitoring.
